How do I write a scientific paper? presents tips on how to present the results of a study, and give it the best chance of publication. How do I submit a paper to a scientific journal? takes you through the processes involved in submitting a paper and reacting to a journal’s response. It also provides guidance on what to do if your paper is rejected or accepted.
Both these guides are contained on the SciDev.Net site, which includes many other guides and useful information about science and writing.